Vacuum pump



March 24, 1925.

c. E. ANDERSON VACUUM PUMP i 7 @ww/IL? ATTORNEY Patented ar. 24, i925.

UNITED STATESPATENT vOFFICE.

CARL E. ANDERSON, OF BROOKLYN, NEW YORK. ASSIGNOR T .AMERICAN MAGHIN @cFOUNDRY COMPANY, A CORPOATION OF NEW JERSEY.

VACUUM PUMP.

Application led. December 22, 1923. Serial No. 682,135.

To all who/m, t may concern:

Be it known that I, CARL E. ANDERSON, a citizen of the United States,residing at Brooklyn, county of Kings, and State of New York, haveinvented a new and useful Improvement in Vacuum Pumps, of

which the following is a specification.

This invention relates to a vacuum pump, and it has for its main objectthe production of a simple pump of this type which is thoroughlylubricated and sealed by means of oil circulating therethrough andreadily adjusted for wear and capable of operation at high speed, whichis that of the commercial electric motor used to drive the pump. Withthis and other objects not specifically mentioned in view, the inventionconsists in certain constructions and combinations which .will behereinafter fully described and then specifically set forth in theclaims hereunto appended.

In the accompanying drawings, which form a part of this specificationand in which like characters of reference indicate the same or likeparts, Fig. 1 is a front elevation, partly in section, of a pumpconstructed in accordance with the. invention;

Fig. 2 is a sideelevation, partly in section taken on the line 2 2 inFig. 1; Fig. 3 is a l ing said cylinder, Y. and means articulated' withand actuated by the piston for controlling circulation of o1l throughsaid reservoir and said cylinder to lubricate the device and to seal thepiston in the cylinderto 4revent air leakage bythe same. In theconstructions the circulation controlling means includes a device whichalternately establishes and disestablishes communication between thereservoir and the cylinder, and operating to feed to the cylinder a veryof o rations.` The parts above mentioned may e widely varie-d inconstruction within the scope of the claims, for the particular deviceselected to illustrate the invention is but one of many, possibleconcrete embodi- 5" ments of the same. The invention, therefore,

est

small quantity of oil once during each cycle` is not to be res-trictedto the precise details of the structure shown and described.

Referring to the drawings, y9 indicates a casting supporting the pumpand in which is formed a cylinder 10 and an oil reservoir 11 surmountingsaid cylinder. Leading to the cylinder 10 is an air intake12 cored inthe casting, and leading from the cylinder 10 isa passage 13, leadingupwardly and opening into the upper part of the reservoir 11 opposite aninclined baiiie plate 14 supported by means of a screw 15 on a shelf 16cast on one of the reservoir lwalls. The top of the reservoir 11 isclosed by means of a cover 17 provided with an air vent 18. y

One end of the cylinder '10 is closed by means of a cylinder head 19 inwhich is formed a bearing 20 for one end 21 of a shaft 2l-'22-23, theparts l21 and 23 of said shaft lbeing coaxial, while the part 22, lyingwithin the cylinder 10, is eccentric thereto. The end 23 of the shaftruns ina bearing 24fformed-in a cylinder head 25 bolted to the maincasting 9 and to the cylinder head 19 by means of a series of throughbolts. The .shaft 23 is packed -by means of a packing ring 26 and gland27 of well known construction and operation.

Working within the cylinder 10 is an annular piston 28 to which ispivoted a vane 29 provided with grooves 30 on one of its faces. Thisvane slides in a suitable ,channel 31 open from the oil reservoir 11 tothe interior of the cylinder 10. The piston 28 rests on a series ofanti-friction rollers 32 which run on the inner periphery of the piston.and upon the base of an annular lchannel 33 formed on an eccentricsleeve 34 which surrounds the eccentric part 22 of the shaft beforereferred to. The channel 33 prevents the rollers 32 from becomingdisplaced endwise.

For the purpose of adjusting the piston 28 withv respect to the innerperiphery of the cylinder l() when wear occurs, the eccentric sleeve 34is turned upon the eccentric 22 and to hold it in adjusted position thesleeve is provided with a lug 35 adapted to engage'in one of a series ofnotches 36 cut in the liange 37 formed on the eccentric part 22 oftheshaft. To eii'ect such adjustment, the cylinder head 19 is removedand the eccentric sleeve 34 is withdrawn until the lug 35 clears theflange 37; `whereupon it is rotated and then pushed back intointerlocked en agement with the eccentric sleeve 37; and te cylinderhead is then replaced. The piston rotates within the cylinder in thedirection shown by the arrow in Figs. 4 to 7 inclusive. When the partsare in the position shown in Fig. 4, direct communication between theoil reservo-ir and the cylinder is cut off or disestablished by thecomplete closure of the channel 31 in which the vane 29 works. Whentheparts reach the position shown in Fig. 5, the vane has been lowereduntil its grooves 30 are about to be opened to the .interior of thecylinder 10 so that oil can flow therethrough into the cylinder. Whenthe parts reach the position shown in Fig. 6, that is, at lower deadcenter, communication between the oil reservoir and the cylinder iscompletely established by the opening of the grooves 30 to ythe cylinderand oil is flowing into-the cylinder on the left side of the piston.When the parts reach the positionshownV in Fig. 7 the iow of oil isstopped, and communication between the oil reservoir 'and the cylinderis again disestablished by the upward movement of the vane 29.

The amount of oil which finds its way through the grooves 30 to thecylinder once during each shaft revolution, is small, but it issuiiicient to produce a film covering the piston and forming aneffectual seal between the same and the inner periphery of the cylinder.Some of the oil finds its way past the endsof the piston to the rollerbearing of the piston and to the plain bearing of the shaft. The excessoil is carried by the air pumped through the cylinder up through thepassage 13 into the upper part of the reservoir 11. The oil entrained inthe air strikes the bale 14 and drops to the body of oil below while theair escapes through the vent 18. It` has been found that'by thus sealingwith oil the piston within the cylinder and by keeping the pistonroperly adjusted by means of the eccentric s eeve 34, and by operatingthe device at the high speed of the commercial electric motor used todrive it, a vacuum of twenty-nine and one-half inches can be maintained;Vand that by throttling the intake .12, the vacuum produced can bevaried at will and maintained. What is claimed is:

1. In a vacuum pump, the combination with a cylinder, of a pistonworkingtherein, a reservoir surmounting said cylinder, and meansarticulated with and actuated by said piston for controlling circulationof oil through said reservoir and said cylinder.

2. In a vacuum pump, the combination with a cylinder, of a pistonworking therein, a reservoir surmounting said cylinder, and meansarticulated with and actuated by said piston for controlling circulationof oilsthrough said reservoir and said cylinder, said means including adevice alternately establishing and disestablishin communication betweensaid reservoir an said cylinder.

3. In a vacuum pump, the combination with a cylinder, of a pistonworking therein, a reservoir surmounting said cylinder, and meansarticulated with and actuated by said piston for controlling circulationof oil through said reservoir and said cylinder, said means including adevice having oil grooves alternately establishing and disestablishingcommunication between said reservoir and said cylinder.

4. In a vacuum pump, the combination with a cylinder, of a pistonworking therein, ayreservoir surmounting said cylinder, and meansactuated by said piston for controlling circulation of oil through saidreservoir and said cylinder, said means including a vane pivoted to saidpiston and having oil grooves always open to said reservoir andintermittently open to said cylinder.

5. In a vacuum pump, the combination with a cylinder, of a pistonworking therein, a reservoir surmounting said cylinder, and meansactuated by said piston for controlling circulation of oil through saidreservoir and said cylinder, and a baiile within said relservoir and inthe path'of the circulating o1 6. In a vacuum pump, the combination witha cylinder, of a piston working therein, a reservoir surmounting saidcylinder, and means actuated by Said piston for controlling circulationof oil through said reservoir and said cylinder, and means forrelatively adjusting said cylinder and said piston.

7. In a vacuum pump, the. combination with a cylinder, of a pistonworking therein, a reservoir surmounting said cylinder, and meansactuated by said piston for controlling circulation of oil through saidreservoir and said cylinder, and means for relatively adjusting saidcylinder and said piston including an eccentric and an eccentric sleevemounted thereon.

8. In a vacuum pump, the combination with a cylinder, of a pistonworking therein, a reservoir surmounting said cylinder, and meansactuated by said piston for controlling circulation of oil through saidreservoir and said cylinder, and means for relatively adjusting saidcylinder and said piston including an eccentric and an eccentric sleevea series' of notches, and an eccentric lsleeve surrounding saideccentric and provided with a lug adapted for selective engagement -witha drive shaft, of an eccentric formed on said shaft vand having a flangeprovided with a series of notches, an eccentric sleeve sur-- roundingsaid eccentric and provided with a lug adapted for selective engagementwith said notches and also provided With an ansaid evlces nular channel,a piston surroundin sleeve, and a series of anti-friction between saidsleeve and said piston and guided by said channel.

12. In a vacuum pump, the combination with a cylinder, of a pistonWorking therein,

la reseryoir surmounting said cylinder, and

a vane actuated by said piston and having a groove always open to saidreservoir and S0 intermittently open to said cylinder' for controllingcirculation of oil through said reservoir and cylinder.

In testimony whereof, I have signed my name to this specification.

CARL E. ANDERSON.

